Spring for pocket-knives.



No. 769,262. PATENTED SEPT. 6, 1904. E. HAMMESFAHR.

SPRING FOR POCKET KNIVES.

APPLIOATION FILED FEB. 16, 1903. NO MODEL.

UNITED STATES Patented September 6, 1904.

ERNST HAMMESFAHR,.OF SOLINGEN, GERMANY.

SPRING FOR POCKET-KNIVES.

SPECIFICATION forming part of Letters Patent No. 769,262, dated September 6, 1904.

Application filed February 16, 1903. Serial No. 143,668. (No model.) I

T 0 (11 whom, it may concern:

' Be it known that I, ERNST HAMMESFAHR, a subject of the Emperor of Germany, residing at Solingen, Foche, Germany, have invented certain new and useful Improvements in Springs for Pocket-Knives; and I do hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to'make and use the same.

This invention for improvements in springs for pocket-knives consists in forming the spring of several thin strips of sheet metal placed close togther.

In the accompanying drawings, Figure 1 is a side view of a pocket-knife constructed according to this invention, one side of the haft being removed.- Fig. 2 is a back view, and Fig. 3 is a side view, showing a slightly-modilied form of spring.

The strips or laminations a are stamped out of different kinds of sheet metal employed for the purpose, the sheet being usually 0.2 to 1.3 millimeters in thickness, according to the nature of the springs, which are stamped out in the most varied forms and held together by the usual rivets.

The advantage possessed by these knifesprings is that they can be cut out of hardrolled and even hardened sheet metal in the most diflicult shapes. In this manner, for example, the Well -known split pocketknife springs, in which the slot at the end resulting from the splitting is covered by the one arm of the spring, which is in the form of a hook Z), Fig. 3, are conveniently produced, Whereas if'they be of stout sheet metal the slit in the spring referred to causes very considerable difficulty. Moreover, the springs when made of thin stamped-out sheet metal do not require any finishing. In fact, the rivet-hole can be formed simultaneously with the stamping out of the thin pieces of sheet metal. Further, in the making of a pocket-knife the springs consisting of several thin pieces are very convenient, as one and the same knifehaft can be furnished with a larger or smaller number of blades,as desired. In connection herewith it is only necessary for the blades 0 cl to be suited to the width of the haft 0, while the width of the recesses in which the blades lie is regulated by the thickness of' a suitable number of the laminations forming the springs.

The new springs are not liable to become relaxed or to break when in use. It is also specially advantageous that if one of the spring-pieces be broken the knife is not thereby made entirely unserviceable, as usually from two to four pieces act on one blade or on any other useful object arranged in the knifeiaft.

What I claim, and desire to secure by Letters Patent, is-

The combination with a pocket-knife haft and blade of a compound spring comprising sheet-metal strips arranged close together in the haft and in a plane parallel with the blade,

substantially as described.

In testimony whereof I have afiiXed my signature in presence of two witnesses.

EENsT HAMMESFAHR. 

